UDP talker combined client and server in C

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Hi,
I have client and server program. How can I make talker which combined server and client in one code, and how can client or server write more than one message(I think to use select()but I don't know how).
Thanks

What I have tried:

I have programs for client and server.

Posted 14-Jun-21 7:13am

Member 15245946

Updated 14-Jun-21 7:29am

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KarstenK 14-Jun-21 13:40pm

when you really want that than use command line for configuration. Example: "udptalker.exe /server" and parse the args to start as server. And vice versa ...

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Greg Utas · Accepted Answer · 2021-06-14T07:29:00

Solution 1

Combining a server and client probably isn't appropriate. They should run on different threads, which should also be separated from their work and GUI threads, respectively. All of them can be in the same .exe, though.

Although it may be more than what you're looking for, here's an example of a UDP thread. It only receives messages because the applications send messages without queueing them for output: UdpIoThread.cpp[^].

Posted 14-Jun-21 7:29am

Greg Utas

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Member 15245946 14-Jun-21 13:38pm

Thanks, and is it possible to have program, where you can send and receive messages, something like communication between to people?
This is my task: network programme enabling mutual
communication between 2 users in UDP. When on standard input, the user starts typing.
waits for the entire line and sends it to the other
when it receives a line from the network, it displays it on the standard
output (waits if the user is already typing)

Greg Utas 14-Jun-21 14:30pm

Sure, it's possible, because there are many existing examples.

If it's just the two users, it's peer-to-peer client without a true server. Each client would have a thread for receiving UDP and a thread for the user interface. The UDP thread would queue an incoming message for the user interface thread, which would read it and display it. This ensures that the user interface doesn't get messed up by the UDP thread writing directly to it. You could probably find a way to safely update the user interface directly, but queueing a message is the way to do it when the UDP thread runs on a server, so coding it that way is good practice.

UDP talker combined client and server in C

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UDP talker combined client and server in C

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